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A flash bulb used for taking photograph ...

A flash bulb used for taking photograph in poor light contains `30 mL` of `O_(2)` at `780 mm` pressure at `27^(@)C`. Suppose that metal wire flashed in the bulb is pure aluminium `(Al)` and it is oxidised to `Al_(2) O_(3)` in the process of flashing, calculate the minimun weight of `Al` wire that is to be used for maximum efficiency.

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0.045g
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